How much does a 1.00 to 1.49ct L SI1 natural round diamond cost?

As of November 6, 2026, 1.00 to 1.49ct L SI1 natural round diamonds typically cost $1,104 USD to $2,921 USD, with a median price of $1,732 USD. There are currently 768 diamonds matching this specification available across retailers.

Where can I find the best price on a L SI1 round diamond?

About 58% of these diamonds are available at multiple retailers, with an average price spread of 42%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.00 to 1.49ct L SI1 Natural Round

Quick answer

As of November 6, 2026, there are 768 natural round diamonds with L color and SI1 clarity in the 1.00 to 1.49ct range available across retailers worldwide. Prices typically run $1,104 USD to $2,921 USD, with a median of $1,732 USD. Half of all listings fall between $1,273 USD and $1,923 USD per carat. The same specification in lab grown form lists at a median of about $873 USD per carat. Over the last 30 days the median price moved +1.1% and the number of listings moved +12.8%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, October 2026: natural diamonds at 2,202 USD per carat and lab-grown at 462 USD per carat, a natural to lab ratio of 4.8 to 1. Round natural stones in the index: 2,124 USD per carat, -6.9% month on month. See the full index release

Figures come from current listings across more than 125 retailers. The index is a monthly release.

Last updated: November 6, 2026

Available

768

Lowest Price

$636 USD

Highest Price

$5,759 USD

Average Price

$1,914 USD

Market Intelligence

Cross Retailer %

57.8%

Price Spread

41.9%

30-Day Price Trend

+1.1%

30-Day Supply Change

+12.8%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$1,551/ct

10th Percentile

$1,054

Median

$1,551

90th Percentile

$2,560

Score Distribution

768 diamonds scored across 4 quality tiers

Excellent

111 (14.5%)

Very Good

278 (36.2%)

Good

197 (25.7%)

Average

182 (23.7%)

Find Your Diamond

Search 768 L SI1 round diamonds and compare prices.

Search Diamonds

Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

M SI1

Save 11%

Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1